Mark Sophir has been a lawyer and partner at Armstrong Teasdale for over 30 years.

He has practiced in a broad spectrum of litigation, including major commercial disputes, significant personal injury cases, professional liability, intellectual property and tax litigation. He is currently of counsel focusing on assessment of risk, evaluation of cases, and collaborating with and mentoring younger attorneys.


  • University of Texas School of Law  (J.D., with honors, 1985)
  • University of Texas at Austin  (B.B.A., with honors, 1981)
    • Accounting


  • Missouri, 1985
  • Illinois, 1986
  • U.S. District Court, Eastern District of Missouri

Professional Activities

  • Washington University (Adjunct Professor)
  • Saint Louis University (Adjunct Professor)
  • Webster University (Adjunct Professor) 

Charitable and Civic Involvement

  • Lift for Life Academy (Tennis Coach and Volunteer)
  • Ferguson Elementary (Volunteer) 
  • Leadership Council on Legal Diversity (LCLD) Mentor


  • Selected as a 2012 Top Rated Lawyer in Commercial Litigation byMartindale-Hubbell and American Lawyer Media (ALM)
  • AV® Peer Review Rated, Martindale-Hubbell


Mark was previously employed as a tax accountant with the international accounting firm of Grant Thornton.

Contact Us
  • Worldwide
  • Boston, MA
  • Denver, CO
  • Edwardsville, IL
  • Jefferson City, MO
  • Kansas City, MO
  • Las Vegas, NV
  • New York, NY
  • Philadelphia, PA
  • Princeton, NJ
  • Salt Lake City, UT
  • St. Louis, MO
  • Wilmington, DE
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Boston, MA
225 Franklin Street
26th Floor
Boston, MA 02110
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Boston, Massachusetts
Denver, CO
4643 S. Ulster St.
Suite 800
Denver, CO 80237
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Denver, Colorado
Edwardsville, IL
115 N. Second St.
Edwardsville, IL 62025
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Edwardsville, Illinois
Jefferson City, MO
3405 W. Truman Boulevard
Suite 210
Jefferson City, MO 65109
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Jefferson City, Missouri
Kansas City, MO
2345 Grand Blvd.
Suite 1500
Kansas City, MO 64108
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Kansas City, Missouri
Las Vegas, NV
3770 Howard Hughes Parkway
Suite 200
Las Vegas, NV 89169
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Las Vegas, Nevada
New York, NY
919 Third Ave., 37th Floor
New York, NY 10022
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New York City
Philadelphia, PA
2005 Market Street
29th Floor, One Commerce Square
Philadelphia, PA 19103
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Philadelphia, Pennsylvania
Princeton, NJ
100 Overlook Center
Second Floor
Princeton, NJ 08540
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Princeton, New Jersey
Salt Lake City, UT
201 South Main Street
Suite 2400
Salt Lake City, UT 84111
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Salt Lake City, Utah
St. Louis, MO
7700 Forsyth Blvd.
Suite 1800
St. Louis, MO 63105
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St. Louis, Missouri
Wilmington, DE
300 Delaware Avenue
Suite 210
Wilmington, DE 19801
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Wilmington, Delaware